If I actually went all in on a single coin, I'd go with Waves + Leases. Safest investment with good returns. I got about ~10% on my initial investment (in about 6 weeks) in leasing rewards and the initial investment went almost x6 at current rates too.
In reality I would diversify though with smaller sums (1-5k) in promising but risky fresh coins for potential x100s.
I'd put 30k into "safe" (lul safe in crypto) coins and spread the rest among riskier, but promising ones.
Either way, I'd definitely pump a lot into Waves since leasing will give you an additional income. There's a chance you could get some mining rewards that themselves will explode as well in the future (do not sell anything you get from leases, peanuts anyways so why bother).